body {
    margin: 15px;
    padding-top: 50px;
}
a {
    cursor: pointer;
}
.layout-tabs {
    margin-bottom: 10px;
}

.demo-widget-fluid {
    border: 1px solid blue;
    height: 100%;
}

.demo-widget-fluid > div {
    border: 1px solid red;
    position: relative;
    top: 50%;
    -webkit-transform: translateY(-50%);
    -ms-transform: translateY(-50%);
    transform: translateY(-50%);
}